Light

Accumulates in pineal in light and some secreted (?)

Norepinephrine released in dark increases cyclic AMP which elevates biosynthesis of N-acetyltransferase

Secreted in darkness ch2ch/nh.

5-hydroxytryptamine (serotonin)

N-acetyltransferase

5-hydroxytryptamine (serotonin)

N-acetyltransferase

Norepinephrine released in dark increases cyclic AMP which elevates biosynthesis of N-acetyltransferase

N-acetylserotonin

Hydroxyindole-O-methyl transferase

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